Draft-regulator for furnaces.



a. H. SCHARF.

DRAFT REGULATOR FOR FURNACES.

APPLICATION FILED DEC. 30, I911.

Patented Feb. 8, 1916.

77 27-72 essa Wa /MK THE couimnm PLANOGRAPH co.. WASHINGTON. D. c.

rarsivr crevice- GREGORY H. SCHARF, OF YPSILANTI, MICHIGAN, ASSIGNOR T6 THE SGI-IARF SMOKE PREV ENTER COMPANY, OF YPSILANTI, MICHIGAN.

DRAFT-REGULATOR FOB. FURNACES.

Application filed December so, 1911.

ments in Draft-Regulators for Furnaces, of

which the following is a specification, reference being hadtherein to the accompanying drawings.

My invention relates to new and useful improvements for draft regulators for furnaces and to that type of regulator whereby upon the opening of the fuel feed door of the furnace, a steam jet which is positioned to discharge across and above the fuel, is turned on, the steam discharging into the furnace cylinders when the door is open and being is closed. j j v The invention resides in the novel Larrangement'ofthe steam jet, in the peculiar COIIStIUClZlOn of the operating connection,

and in certain combinations, arrangements and constructions of various parts as will be more fully hereinafter described and particularly pointed out in the claims.

In the drawings, Figure 1 is a" front elevation of a furnace with my invention applied thereto; Fig. 2 is a fragmentary vertical section through the structure pflri 1; Fig. 3 is acentral section through the dash pot, and Fig. 4 is a detailview. partly in section, of the valve controlling the supply of steam to the furnace. I

A designates the boiler front. B and C the fuel doors, and the supply pipe for i the steam jets or nozzles.

E are dampers for the doors pivoted thereto at F. and G is a rock shaft journaled above the doors in bearings H on the boiler front. This rock shiaft'is connected to the dampers by means of links I each having its opposite ends pivoted respectively to a lug J on the damper and "an arm I; on the shaft G. The armhK is 'fOrmed'integral with a collar L which has a longitudinal and rotative adjustable engagement wlth the shaf the collar being held in its adjusted position by a set-screw L. and the pivots for the. o posite ends of the link arena.

ranged substantially at right angles to the hinge connection'for the door. This arrangement causes the link and arm to effect rocking of the shaft G upon the open Specification of Letters Patent.

gradually shut-o'fl' after the door rod will lift the piston Patented Feb. 8, 1916.

Serial No. 668,596.

ing of the door and permits the collar to be adjusted lengthwise of the shaft so as to vary the degree of movement of the latter.

N is a rod pivoted at its lower end to a rock arm 0 and similarly connected at its upper end to an arm Pf intermediate the ends of the latter. Pivotally connected to one end of the arm P is a piston rod Q of a dash pot R, while the opposite end of this arm is secured to the lever T of the valve U which controls the steam supply pipe D. The arm 0 is adjustable in relation to the shaft G and is secured in its adjusted position by a set-screw D.

Vith the construction described. upon the opening of the door the shaft G will be rocked, which will actuate the rock arm 0 and raise the rod N. The raising of the of the dash pot and also operate the valve lever to open the valve and admit steam to the supply pipe. When the doors are closed the dash pot will retain the rod in its raised position. which will prevent the shaft G from rocking, thereby effecting an opening of the dampers. As thepiston of the dash pot descends the shaft G and the arm 0 will be rocked, permitting the valve on the dampers to be gradually closed.

It will be noticedthat the connection between the various parts is such as to effect a positive operation thereof in both the opening and closing movement. The desired relative movement between the piston of the dash pot and the fuel doors may be obtained bya'diusting the arms 'K. and O.

In Fig. 3 I. have illustrated a novel construction of dash pot which is particularly adapted for controlling the closing of the dampers and the steam valve. As shown. A designates the cylinder which is provided with brackets B that are attached to the front A. C is an enlargement at one side of the cylinder which has a bypass D communicating by means ,of a bore E with the cylinder chamber at the bottom thereof and provided adjacent the top with an opening F leading within the cylinder. Above this opening is an aperture G also extending through the cylinder wall. The opening F is controlled by an inlet valve. H while the aperture G. is normally closed by means of a valve I. Preferably the piston is hollow and has a spider K at the top thereof provided with a bearing U to which is secured downward movement of the valve.

' inlet valve H.

pass up the valve N, but upon the downward movement of the piston the valve N will. be closed, which forces the liquid through the restricted passage D and out through the opening F. R is a recess formed in the side wall. of the cylinder and a leading from the opening F to the top of the piston. Thus in case the piston is raised above the opening F communication will be provided between the passage D and the portion of the cylinder above the piston.

In case it is desirable to permit the piston to immediately descend upon the closing of the door, the valve I is adjusted to open the passage G. The speed with which the piston descends may be varied by adjusting the Preferably a strainer S is arranged within the passage D Heretofore the nozzles or steam jets have been positioned in apertures formed through the brickwork above thefuel doors, but this arrangement has been found to be very objectional since by so locating the jets the latfurnace walls.

ter are subjected to an intense heat and would frequently crystallize and breakoff when steam was introduced therethrough. Furthermore, when extended through the brickwork the condition of the jets could not be ascertained without completely removing the latter. By my invention the jets a b are arranged within the door openings adjacent the top thereof, the jets being supported solelv bva horizontal branch 0 of the ste m supply pipe and being out of contact with the (Z is a bracket on the boiler front for securing the horizontal branch in place. Preferably the jets have aswiveled engagement as ate with couplings f in the branch 0 and the nozzles proper 9 have a detachable screw-threaded engagement with elbow joints h. Character 2' are recesses in the top of the doors for receiving the jets when the doors are closed. lVith this arrangement the jet is in view when the fuel door is open, while the swivel connection permits the jet to be turned outward so that thenozzle may be readily detached and a 'new one replaced when reauired. Furthermore, the nozzle is not subjected to "the intense heat that it would be if extended through the wall of the boiler front, and as it is not necessary to drill holes through the front wall my improved device mav be applied to a furnace when the latter is in operation.

In order to insure the full closing of the damper and "the valve, the passage D is provided with an unrestricted port T, which is normally closed by thepiston but is so positioned that when the piston is at the downward limit of its movement the port will be uncovered,thereby permitting any oil in the bottom of the cylinder to pass throughthe port T.

lVhat I claim as my invention is 1. In a draft regulator for furnaces, the combination with a damper of a fuel door, a steam-supply pipe,a jet leading from the pipe within the furnace, a valve controlling the admission of steam to the jet, a rock shaft, a rock arm fixed to the shaft, a rigid rod having the opposite ends thereof pivotally connected respectively to the arm and the damper, whereby upon the opening of the fuel door the rod will be actuated by the chamber to rock said shaft, a second rock. 7

arm secured to the shaft, a rod having one end pivoted to the latter arm, a connection between the other end of the rod and the valve, and a timed retarding device for con trolling the closing of the damper and the valve upon the closing of the fuel door.

2. In a furnace, the combination with a valve or damper of means for operating the same in one direction and a retarding device for controlling movement thereof in the opposite direction, comprising a cylinder, a piston therein, a passage communieating with the cylinder at the bottom thereof, a restricted port leading from the passage to the interior of the cylinder adja 1 cent the top thereof, an opening above said port also forming a communication between the aassa 'e and the interior of the c hnder and a normally closed valve controlling said 7 port.

3. In a draft regulator for furnaces, the

combination of a damper of a fuel door, a

steam supply pipe, ajetleading from the pipe within the furnace, a valve controlling the admission of steam to thejet, positively connected levers of fixed length connecting the damper and the valve including a-rockable member, a rigid rod of. fixed length secured to said member and saiddamper, whereby upon the opening of the damper said member will be rocked, a rod attached to said rockable memberand operatively secured to said valve, and a timed retarding device for controlling the closing of the damper and valve. v

4. In a draft regulator for furnaces, the combination of a valve or damper, of means for operating the same in one direction and a retarding device for controlling movement thereof in the opposite direction, comprising a cylinder, a piston therein having an opening in its bottom, a valve controlling said opening, a spring normally closing said valve arranged withinthe piston, a spider carried by the piston for limitingthe opening movement of the valve, and a restricted passage permitting the flow of fluid from the chamber on one side of the piston to the chamber on the opposite side When the piston is moved in one direction.

5. Ina draft regulator, the combination with a valve or damper, of means for operating the same in one direction and a retarding device for controlling movement thereof in the opposite direction, comprising a cylinder, a piston therein, a restricted passage permitting the flow of fluid from the chamber on one side of the piston to the chamber on the opposite side When the piston is moved in one direction, an unrestricted port permitting passage of the fluid from one of said chambers to the other when the piston is moved in the opposite direction, and means for forming a substantially unrestricted conduit out of said restricted passage.

6. In a furnace, the combination With a valve or damper, of means for operating the same in one direction and a retarding device for controlling movement thereof in the opposite direction, comprising a cylinder, a by-pass communicating with the cylinder adjacent the bottom thereof and leading to adjacent the top of the cylinder, a piston having an opening in its bottom, and a spring-pressed valve normally closing said opening, the side wall of the cylinder being provided with a recess leading to the top of the cylinder, for the purpose described.

7. In a draft regulator for furnaces, the combination With a valve or damper, of means operating the same in one direction and a retarding device for controlling movement thereof in the opposite direction, comprising a cylinder, a piston within said cylinder having an opening in its bottom, a valve controlling said opening, a spider carried by said piston for directly limiting the opening movement of said valve, and restricted means of communication between the chambers on opposite sides of the piston when said piston is moved in one direction.

In testimony whereof I aflix my signature in presence of two witnesses.

GREGORY H. SGHARF.

lVitnesses:

W. J. BELKNAP, JAMES C. BARRY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

